19
WIRING
3.4.3 Master/slave operation when connecting several brake
units
Parallel operation by master ⇔ slave operation (10 units maximum)
When several units are conected, make sure to connect a signal cable to
terminals (MSG, SD) for master/slave to operate.
GRZG
MC
R/L1
Motor
IM
Inverter
Brake unit FR-BU2
Brake unit FR-BU2
Brake unit FR-BU2
S/L2
T/L3
U
V
P/+
N/-
W
Three
phase
C
power
supply
MCCB
P/+
N/-
P/+
N/-
P/+
N/-
BUE
SD
MSG
SD
MSG
SD
PR
BUE
SD
MSG
SD
MSG
SD
PR
BUE
SD
MSG
SD
MSG
SD
PR
PR
PX
*1
*3
*3
External thermal relay
GRZG type
brake
registor
TH
External thermal relay
GRZG type
brake
registor
TH
External thermal relay
GRZG type
brake registor
TH
*2
*4
*4
*1 When using the FR-BU2 with the FR-
A500, A700 series inverter 7.5K or less
or FR-V500 series inverter 5.5K or less,
be sure to remove a jumper across
terminal PR and PX.
*2 When connecting several FR-BU2 to
one inverter, connect P/+ of each FR-
BU2 and of the inverter and N/-
respectively. Do not pass wires from
terminal P/+ and N/- of the FR-BU2 to
terminals of other FR-BU2.
*3 It is recommended to install an external
thermal relay to prevent overheat of
brake resistors.
(Refer to page 17)
*4 The wiring length of the terminal MSG
and SD should be 10m maximum. In
addition, twist five times or more per
1m.
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